Static eliminator



A l 625 445 April 19, 1.927, J. ASTROM ET AL Y v sTATIc ELIMINATOR Filed Marohd, 1925 f7 @S/ow man jfma/// 'Patented Apr. 19,1927.

i UNITED STATES 'PATENT OFFICE.' I

JOHN ASTROM AN D VERNON L. TANNEHILL, 0F FORT WAYNE, INDIN A.

sTAmIcanimaron.

Appucation mea March 16,1925. serial No. 15,865.

This invention"relates to static eliminators.

In radio reception it is well known that the static disturbances frequently preclude using the device. This type ofv disturbance is particularly noticeable with the sets employing material amplification.

Objects of this invention are to provide a very simple and practical static eliminaform of the invention.

,such cylinders being of insulating material such, for example, as glass.

The ends of the outery and inner cylinders 3 and 4 are received in suitable grooves in the members 1 and 2 and gaskets, such as yielding rubber members, are em loyed for insuring an air tight and water tight joint.

Between the inner and outer cylinders, a coil or helix 5 of wire is formed which is preferably spaced from the glass inner cylinder 4, as shown in the drawings. A small helix 6 is positioned inside of the inner cylinder 4 and spac'ed,therefrom,-as shown, The end of the helix 6 passes into a small metal tube 7 carried by the head 2 and is soldered securely therein to afford a water tight joint accessible from the exterior and adapted to receive a suitable connecting plug. The end of the helix 5 is simllarvly soldered in a connecting tube of metal such as indicated at 8, and \a second loop 9 of wire is also soldered in this tube. The end of the wire 9 is soldered in a metal tube 10 similar to the tube 7. The upper. or cap member 2 is'` upwardly bulged to provide a recess `11, and a small helix 12 is positioned withinfthis recess. d Its end is soldered securely in the metal tube 13.

The space between these cylinders 3 and 4 is filled with a suitable conducting liquid such for instance as salt water and the inner cylinder 4 is lled to approximately its upper end with a similar solution, as shown in Figure l, such liquid, however, stopping short ofthe upper coil 12. The cap 2 and base 1 are held-'tightly together by means of atie bolt 14 which is threaded into a suitable recess in the cap, and which projects through the base 1. A clampin nut 15 is screwed upon the lower end of t e tie rodv14 and its upper flat face forms a water tight joint with the base 1. Thus the parts are' readily separable and are yet securely held together in a watery tight and air tight relation.

Figure 2 shows a form of invention very similar to that previously described, with fthe exception, however, that the coil 12 is omitted. In this form the inner and outer cylinders 4 andv 3 are similarly carried by the end members land 16. These members are constructed in the same manner as that disclosed for the members 1 and 2. In fact the member 1 is a duplicate of the correspondingly numbered member of Figure 1.V

The inner helix 6 is soldered in a water tight manner to the metal tube 17 projecting through, the top 16. The other or outer helix 5 is connected to a `metal tube 10 identically in the same manner as that previously described.

Figure 3 shows a form of invention in which the hard rubber end pieces are omitted. In this form the outer cylinder-18 is formed with an integral -bottom 19 and an integral top 20. The inner cylinder 21 is integrally formed with the top 20 and is carried thereby. The lower end of the inner cylinder is completely closed by the integral base 22. These-members are preferably formed, as a unit, from glass.

The inner helix 22 and the outer helix 23 have their ends sealed in the glass and connected with conductors 24 and 25, respectively.

In the form shown in Figure 4 substantially the same construction as described in Figure 3 is followed. For example, the outer cylinder 26 and the inner cylinder 27 extend to common top and bottom members 28 and 29, respectively, and a're 'integrally joined thereto. 22 and 23 are connected to the condiictors 24 and 25, as previously described. If desired, the conductoi` 25 may pass through the side wall of the cylinder 26.

The inner and outer helices ln each oi the :torina of invention illustrated, a .liquid conductor such as common salt water is employed in each of the cyl inders. However, it has been iound that the apparatus will operate Without such liquid conductor although not so satisfactorily.

ln using the device, one of the helices or coils, for instance, the inner coil is connected directly with the antenna. The other coil or outer coil is connected directly with the radio receiving set.

ln the form shovvn in Figure l, the coil l2 is connected directly to the ground lead o the receiving eet or else directly to a separate ground. lt has been found that the oscillatory energy is readily transmitted :from one coil to the other coil and to the receiving set but that the static disturbances are substantially eliminated and will not pass through the apparatus from the inner coil to the outer coil.

lthoughthe exact theory of the operation of the device is not `Wholly understood, it is coniidently believed that the inner coil sets up the periodic, magnetic pulsations which are readily picked up by the outer coil and transmitted to the receiving set, While the static disturbances are not transmitted from one coil to the other coil.

(ln using the form illustrated in Figure l, an improvement was efi'ected by elnploying the auxiliary coil l2 which is connected to the ground. rllhis coil carries away the static electricity brought in b the antenna and leads such electricity d1- rectly to the ground. ln actual tests conducted With this apparatus connected and used as described, it was found that the reception Was remarkably clear and strong and that a substantially entire labsence ot' static disturbance was -found even under extreme conditions.

From these practical tests and use of the different devices, it is certain that a very great improvement in radio reception is secured by the practice of this invention.

ltlthough the invention has been described nannies in considerable detail., it is to be understood that the invention may he variously emhodied and is, therefore, to be limited only as claimed.

We claim:

1. A static eliminator comprising an inner vertical cylinder and an outer concentric vertical cylinder, end members closing the ends of said cylinders, an inner helix located Within the inner cylinder, a liquid A conductor partially illling said inner cylinder, a second helix located above said liquid conductor, a third helix surrounding said inner cylinder and enclosed by said outer cylinder, and a liquid conductor carried Within said outer cylinder.

2. A static eleminator comprising an outer and an inner cylinder of insulating material, insulating gaskets closing the upper and lower ends of said cylinders and rendering the space Within the inner cylinder and the space between the inner and outer cylinders completely inclosed spaces, a metal helix in the space between said cylinders and having means for connection at one end, a second metal helix Within the inner cylinder and having means for connection at one end, said helices being free from connection with other and an electrolyte carried Within each of said spaces.

3. A static eliminator comprising an inner vessel of insulating material, an outer vessel of insulating material, insulating members completely closing the inner vessel and the space between the inner and outer vessel, electrolyte in the inner vessel, electrolyte in the space between the inner and outer vessels, a separate and distinct conductor projecting into each electrolyte and having externally accessible connecting portions.

ln testimony that We claim the foregoing we have hereunto set our hands at Fort Wayne, in the county of Allen and State of Indiana.

:foHN As'rnoM. VERNON L. TnNNni-nnr.. 

